Best way to speed up a slow computer

Cleaning the registry generally causes more problems than it solves so should be avoided. There is little evidence that doing this improves performance and much that it does not.

You can use various software like krojam cleaner to boost up start up speed. You can also run disk cleanup for your C drive. Thanks..

u want my advice ? reinstall or restore it to the first time u touch it , and never use anything to tweak your pc , do use Ccleaner or windows cleaner , but dont use tweakers , they'll just slow your pc down time to time and eventually gonna stab u in the back